As i understand it the memory in ram gets corrupted after a while through external influence. I believe that as the memory gets updatet frequently (maximum 48 hours) it should be very unlikley for the memory to get corrupted in that timespan. And as the price for ECC-ram is double that of ram without ECC the question is if thats worth the money.

Pretty tough to second guess. Depends on the software you are running, and the length of time it is running between reboots, quitting and restarting the application or closing and reopening the data set. (The nature of soft memory errors is that they are erased when the data is erased or written over. They are a problem only when the data bit is read again after the error occurs.)

ECC RAM will recover from single-bit errors, but it will still crash on errors of 2 bits or more.

RAM errors are rare: soft errors (that is, not cause by a physical fault in the RAM module) are primarily caused by cosmic radiation. One figure I have seen is one error bit per 750 hours of operation. You'll have to do the math and estimate if this poses an unacceptable risk to your environment.

If you compare equivalent modules, ECC RAM is not double the price of non-ECC (where did you get that idea?), it is more like 20% higher.

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